It started badly as the apartment has no wifi (difficult for tourist like us who has no 4G sim card) and had no electricity! The problem was known but we havent been told so we discovered it while in the apartment... (It is supposed to be fixed soon, but too late for our stay).
Fortunately, Joy speaks really good english and put us into another apt. which was much better and she gave us advice about places to visit in Bangkok.
3stars/5 = 1 star/5 for the first apt. (we lost half a day to reach the second apt. whereas we had 3 days in Bangkok)
And 5stars/5 for Joy's issue solving management + nice apt.